I'd recommend a bigger margin from both ends, max to 3.6 ( as over 3.65 is the absolute no-go zone ) and discharge to 2.8. You'll lose less than 1% capacity but will gain in Battery lifetime and safety.
To the sleep waiting time - just put 65535 and it will never go to sleep - this is the behavior we usually want.
Ah about the parallel batteries. I have a similar setup - built my fist bank of 16x280ah Eve batteries. Realized it was not enough and decided to build another one. I read a lot about putting both in parallel and came also to know about this parallel module from Daly. I read in other forum that the only thing it does is to let the BMS know the amperage between the two BMS so it can manage any spikes.
I decided to give it a try without this extra module per two reasons: My batteries are apart from each other by 15m and i want the setup to be simpler as possible.
When i connected them at first time (with a two input/one output switch), i made it sure that both average voltages were a match. I set both Daly's to not let battery charge or discharge over 1C( 280A). I saw some current flow of around 10A for about 15min until it stabilized.
I have disconnected the banks many times after that, having one running and other in standby and reconnected them with SOC difference about 50% (this was the largest gap I connected once). With 50% I saw a spike of 160A, after 30s it was down to 60A and they went to equilibrium in about more or less 1 hour.
You need a T-fuse in both battery banks when you connect them in parallel. In my experience i think the BMSs are able to manage the situation in a calm manner, if the SOC gap is really huge - lets say 90% (which I have controls to not happen) so the BMS will see a current overload and disconnect the MOS, You'll need then to manually either discharge or charge banks aiming for a voltage match to have them back connected and online.
I have some automation on Homeassistant and nodered to prevent any BMSs to be back online with big SOC gap and also all automations that triggers MOS on/off are also minding the situation. I know these are software controls, but ultimatelly i expect the BMS to disconnect in case it happens, and if the BMS does not, the fuse should do the job. If all controls fails, letś say the battery have a surge of charge/discharge of 5C it will be for a short time. Although is not great for the batteries, i don't belive it alone will cause some serious trouble to the batteries, but wiring may suffer.
This is my experience and it's up to you. I personally stay with my controls over whatever Daly have implemnted as i am not sure about what it is and what it does exactly...
